CN106839993A

CN106839993A - A kind of linear movement pick-up based on fiber grating

Info

Publication number: CN106839993A
Application number: CN201510883360.5A
Authority: CN
Inventors: 杨楠; 包艳; 郑普超; 张兵; 张超
Original assignee: No 618 Research Institute of China Aviation Industry
Current assignee: No 618 Research Institute of China Aviation Industry
Priority date: 2015-12-04
Filing date: 2015-12-04
Publication date: 2017-06-13

Abstract

The present invention relates to a kind of linear movement pick-up based on fiber grating, fiber grating (5) is bonded in the strong cantilever beam of first grade (11) of double strong cantilever beams of grade (2) and the groove (13) of the second grade strong cantilever beam (12) upper and lower surface center line section respectively by optical cement (6), tail optical fiber (10) is drawn by tail optical fiber fairlead (9), double strong cantilever beams of grade (2) are by cantilever beam fixing end (7) in housing (1), and be bonded by dispensing hole (8) with optical cement (6), wedging movement iron core (3) is inserted in housing (1) along guide groove (10), then bonnet (4) is pasted onto on housing (1).The present invention has that sensitivity is high, electrical insulating property is good, size is small, electromagnetism interference, is easily combined with wavelength-division multiplex and time division multiplex system and sets up the particular advantages such as Distributed Measurement System.Miniature linear displacement sensor can be made according to specifically used environment simultaneously, applied on the carriers such as small aircraft.

Description

A kind of linear movement pick-up based on fiber grating

Technical field

The invention belongs to optical sensor technology, and in particular to a kind of linear movement pick-up based on fiber grating.

Background technology

Mechatronic Systems and hydraulic system can be long because it has the excellent of many uniquenesses with not waning in aviation Point.But, they there is also some intrinsic defects, can not most importantly defend thunder and lightning, electromagnetic interference With electromagnetic impact etc..Improve constantly with present generation aircraft performance, the maximization of aircraft and using redundancy technology and Electronic equipment increasingly complex, necessarily causes the increase of cable consumption, configuration complicated, increased each circuit Between interference, circulation influence each other, make system cisco unity malfunction.Current safeguard procedures are to adopt Electricity consumption Magnet clamp, but electromagnetic interference can not possibly be completely defendd, but cause the increase of aircraft weight.Future Aircraft hope replaces the replacement of aluminium alloy, particularly plane aluminium alloy covering largely to subtract with composite It is weak or even eliminate electromagnetic shielding action.In addition, the electromagnetic radiation of the nuclear explosion generation of aircraft exterior and machine High power laser, directed energy weapon of load etc. are equipped, and are produced in electricity, magnetic field from low to high at a relatively high The electromagnetic interference of intensity, it is very harmful to fly-by-wire.

Fly by light system has significant advantage relative to traditional fax control system, such as can effectively defend Thunder and lightning, electromagnetic interference and electromagnetic impact, the electromagnetic pulse caused to nuclear blast are insensitive, in the absence of plain conductor Intrinsic ground backflow.Have the advantages that small volume, lightweight, transmission capacity are big simultaneously such that it is able to significantly Improve the handling quality of aircraft, improve the reliability and survival ability of flight control system.It is external from twentieth century seven The ten's began to the research of fly by light system, used as the light position of fly by light system key measuring cell Displacement sensor also enters development simultaneously.Optical displacement sensor can be realized based on various optical principles, its Middle to use fiber grating as Sensor core sensing element, sensitivity is high, electrical insulating property to have sensor Good, small, lightweight size, electromagnetism interference, it is anticorrosive, easily with wavelength-division multiplex and time division multiplex system phase With reference to the particular advantages such as Distributed Measurement System are set up, as a kind of light that domestic and international research staff pays close attention to Displacement transducer.

The purpose of the present invention is：The present invention devises a kind of linear movement pick-up based on fiber grating, this Sensor has electromagnetism interference, easy multiplexing, can constitute distribution biography relative to conventional electromagnetic displacement transducer Feel the advantage of network, be electromagnetic sensor excellent supplement and substitute.Simultaneously can be according to specifically used ring Border, is designed to miniature linear displacement sensor, applies on the carriers such as small aircraft.

The technical scheme is that：A kind of linear movement pick-up based on fiber grating is by housing 1, double etc. Strong cantilever beam 2, wedging movement iron core 3, bonnet 4, fiber grating 5, optical cement 6 are constituted；Fiber grating 5 By optical cement 6 respectively in the strong strong cantilever beam 12 of the grade of cantilever beam 11 and second of the first grade of the strong cantilever beam 2 of double grades Bonding, tail optical fiber 10 is drawn by tail optical fiber fairlead 9 in the groove 13 of upper and lower surface center line section, double etc. Strong cantilever beam 2 is arranged in housing 1 by cantilever beam fixing end 7, and passes through dispensing hole 8 with optical cement 6 Bonding.Wedging movement iron core 3 is inserted in housing 1 along guide groove 10, bonnet 4 is then pasted onto housing 1 On.

Measurement displacement of the lines principle of the invention is, using the characteristic sensitive to axial strain of fiber grating 5, to work as wedge When shape motion iron core 3 is moved forward and backward, the strong strong cantilever beam 12 of the grade of cantilever beam 11 and second of the first grade will be applied Amount of deflection, makes it produce the strain that strain and the position of upper and lower surface groove 13 produce equal in magnitude, and upper surface produces Negative strain, lower surface produces normal strain.Answering on the strong strong cantilever beam 12 of the grade of cantilever beam 11 and second of the first grade Change is transferred on fiber grating 5, causes the centre wavelength of fiber grating 5 to change.While optical fiber light Grid 5 are also temperature sensitive, by the fiber grating 5 to the strong cantilever beam upper and lower surface symmetry arrangement of same grade The variable quantity of centre wavelength value is demodulated, you can eliminates the centre wavelength drift that temperature causes, obtains first Etc. the axial strain of the strong cantilever beam 12 of grade of strong cantilever beam 11 and second, so as to obtain wedging movement iron core 3 Displacement.

It is an advantage of the invention that：The present invention is with sensitivity is high, electrical insulating property is good, size is small, anti-electromagnetism is done Disturb, be easily combined with wavelength-division multiplex and time division multiplex system and set up the particular advantages such as Distributed Measurement System.Together When miniature linear displacement sensor can be made according to specifically used environment, apply in carriers such as small aircrafts On.

Brief description of the drawings

Fig. 1 is the linear movement pick-up positive structure diagram based on fiber grating；

Fig. 2 is the linear movement pick-up overlooking the structure diagram based on fiber grating；

Fig. 3 is working sensor schematic diagram；

Specific embodiment

The invention will be further described for citing below in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 2, the present invention be by the strong cantilever beam 2 such as housing 1, double, wedging movement iron core 3, Bonnet 4, fiber grating 5, optical cement 6 are constituted；Fiber grating 5 is hanged by force in double grades respectively by optical cement 6 The groove 13 of the first grade strong upper and lower surface center line section of cantilever beam 12 of the strong grade of cantilever beam 11 and second of arm beam 2 Interior bonding, tail optical fiber 10 is drawn by tail optical fiber fairlead 9, and double strong cantilever beams 2 of grade pass through cantilever beam fixing end 7 are arranged in housing 1, and are bonded by dispensing hole 8 with optical cement 6.By wedging movement iron core 3 along guide groove In 10 insertion housings 1, then bonnet 4 is pasted onto on housing 1.

Referring to Fig. 3, linear movement pick-up 17 is connected by optical fiber 19 with fiber coupler 16, optical fiber coupling Clutch 16 connects (FBG) demodulator 15, and (FBG) demodulator 15 is connected with computer 14 by data line 18 then.

Referring to Fig. 1, Fig. 2 and Fig. 3, the broadband light that (FBG) demodulator 15 sends passes through optical fiber 18 and fiber coupler 15 incide on the fiber grating 5 of linear movement pick-up 17, and receive by optical fiber 18 and fiber coupler 15 narrow band lights for returning.When wedging movement iron core 3 is moved forward and backward, will be to the strong cantilever beam 11 of the first grade and Second-class strong cantilever beam 12 applies amount of deflection, it is produced the strain that strain and the position of upper and lower surface groove 13 produce Equal in magnitude, upper surface produces negative strain, lower surface to produce normal strain.The strong cantilever beam 11 and second of first grade It is transferred on fiber grating 5 etc. the strain of strong cantilever beam 12, causes fiber grating 5 to produce strain, makes it Centre wavelength changes.Fiber grating 5 is simultaneously temperature sensitive, and temperature fluctuation can also cause wherein cardiac wave Change long.By the centre wavelength of fiber grating 5 to the strong cantilever beam upper and lower surface symmetry arrangement of same grade The variable quantity of value is demodulated, you can eliminates the centre wavelength drift that temperature causes, obtains the first strong cantilever of grade The axial strain of the strong cantilever beam 12 of the grade of beam 11 and second, so as to obtain the displacement of wedging movement iron core 3.

Claims

1. a kind of linear movement pick-up based on fiber grating, it is characterised in that：The sensor is by housing (1), strong cantilever beam (2), wedging movement iron core (3), bonnet (4), fiber grating (5), the light such as double Learn glue (6) composition；Fiber grating (5) is by optical cement (6) respectively in double strong cantilever beams of grade (2) The groove (13) of the strong cantilever beam of the first grade (11) and the second grade strong cantilever beam (12) upper and lower surface center line section Interior bonding, tail optical fiber (10) is drawn by tail optical fiber fairlead (9), and double strong cantilever beams of grade (2) are by outstanding Arm beam fixing end (7) is bonded with optical cement (6) in housing (1) by dispensing hole (8), Wedging movement iron core (3) is inserted in housing (1) along guide groove (10), then bonnet (4) is pasted onto On housing (1).

2. a kind of linear movement pick-up based on fiber grating as claimed in claim 1, it is characterised in that： Using fiber grating (5) characteristic sensitive to axial strain, when wedging movement iron core (3) is moved forward and backward, Amount of deflection will be applied to the strong cantilever beam of the first grade (11) and the strong cantilever beam of the second grade (12), and it is produced strain And the strain of upper and lower surface groove (13) position generation is equal in magnitude, upper surface produces negative strain, lower surface Produce normal strain.Strain in the strong cantilever beam of first grade (11) and the strong cantilever beam of the second grade (12) will be transmitted Onto fiber grating (5), (5 centre wavelength changes to cause fiber grating.While fiber grating (5) Also it is temperature sensitive, by the fiber grating (5) to the strong cantilever beam upper and lower surface symmetry arrangement of same grade The variable quantity of cardiac wave long value is demodulated, you can eliminates the centre wavelength drift that temperature causes, obtains first etc. The axial strain of strong cantilever beam (11) and the strong cantilever beam of the second grade (12), so as to obtain wedging movement iron core (3) displacement.